Human Inflammatory Dendritic Cells Induce Th17 Cell Differentiation

Immunity. 2013 Feb 21;38(2):336-48. doi: 10.1016/j.immuni.2012.10.018. Epub 2013 Jan 24.

Abstract

Dendritic cells (DCs) are critical regulators of immune responses. Under noninflammatory conditions, several human DC subsets have been identified. Little is known, however, about the human DC compartment under inflammatory conditions. Here, we characterize a DC population found in human inflammatory fluids that displayed a phenotype distinct from macrophages from the same fluids and from steady-state lymphoid organ and blood DCs. Transcriptome analysis showed that they correspond to a distinct DC subset and share gene signatures with in vitro monocyte-derived DCs. Moreover, human inflammatory DCs, but not inflammatory macrophages, stimulated autologous memory CD4(+) T cells to produce interleukin-17 and induce T helper 17 (Th17) cell differentiation from naive CD4(+) T cells through the selective secretion of Th17 cell-polarizing cytokines. We conclude that inflammatory DCs represent a distinct human DC subset and propose that they are derived from monocytes and are involved in the induction and maintenance of Th17 cell responses.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • CD4 Antigens / genetics
  • CD4 Antigens / immunology
  • Cell Differentiation
  • Cells, Cultured
  • Dendritic Cells / immunology
  • Dendritic Cells / pathology*
  • Humans
  • Immunologic Memory
  • Inflammation / genetics
  • Inflammation / immunology
  • Inflammation / pathology*
  • Interleukin-17 / biosynthesis
  • Interleukin-17 / immunology*
  • Lymphocyte Activation
  • Macrophages / immunology
  • Macrophages / pathology*
  • Monocytes / immunology
  • Monocytes / pathology*
  • Organ Specificity
  • Signal Transduction
  • Th1-Th2 Balance
  • Th17 Cells / immunology
  • Th17 Cells / pathology*
  • Transcriptome / immunology

Substances

  • CD4 Antigens
  • Interleukin-17